ASoC: ac97: Support multi-platform AC'97

Currently we can only have a single platform built in with AC'97 support
due to the use of a global variable to provide the bus operations. Fix
this by making that variable a pointer and having the bus drivers set the
operations prior to registering.

This is not a particularly good or nice approach but it avoids blocking
multiplatform and a real fix involves fixing the fairly deep problems
with AC'97 support - we should be converting it to a real bus.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/sound/soc/pxa/pxa2xx-ac97.c b/sound/soc/pxa/pxa2xx-ac97.c
index 57ea8e6c5488..a3c22ba25f08 100644
--- a/sound/soc/pxa/pxa2xx-ac97.c
+++ b/sound/soc/pxa/pxa2xx-ac97.c
@@ -41,13 +41,12 @@ static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
         pxa2xx_ac97_finish_reset(ac97);
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
         .read   = pxa2xx_ac97_read,
         .write  = pxa2xx_ac97_write,
         .warm_reset     = pxa2xx_ac97_warm_reset,
         .reset  = pxa2xx_ac97_cold_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
         .name                   = "AC97 PCM Stereo out",
@@ -244,6 +243,10 @@ static int pxa2xx_ac97_dev_probe(struct platform_device *pdev)
                 return -ENXIO;
         }
 
+        ret = snd_soc_set_ac97_ops(&pxa2xx_ac97_ops);
+        if (ret != 0)
+                return ret;
+
         /* Punt most of the init to the SoC probe; we may need the machine
          * driver to do interesting things with the clocking to get us up
          * and running.
@@ -255,6 +258,7 @@ static int pxa2xx_ac97_dev_probe(struct platform_device *pdev)
 static int pxa2xx_ac97_dev_remove(struct platform_device *pdev)
 {
         snd_soc_unregister_component(&pdev->dev);
+        snd_soc_set_ac97_ops(NULL);
         return 0;
 }